Not too familiar with this boat but...It's a Nice looking hull and should do well in the Gulf. What Power are you planning on? Have you core sampled the Transom? Do you know the Storage and Maintenance History of the hull? Does the Deck have any soft spots?
Well for sure, you're gunna need a NEW Transom and more than likely a new Deck and Stringers/Bulkheads below deck. This will be a minimum of 200 man hours to restore Plus the Money I mentioned. Lots of Work and being 23 ft you'll need a BIG workplace. Do you have a place to put her so you can tear her down?
The pic you posted of the transom sure doesn't make it look like a good to go transom. But the outside is NOT the best indicator of what the core is like.